Photo frame



FIG. 1 is a front elevational view of a photo frame, in a vertical position, showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view of the photo frame, in a horizontal position;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a left side elevational view thereof. 

The ornamental design for a photo frame, as shown and described. 